So, funny story.
When I was four years old or so, my mother was convinced I was a cute enough kid to play one on television, so she had me try out for a few commercials. The closest I got to actually getting a part was one for a water toy called "Waterfuls," or something like that. I got three callbacks, and ended up performing the scene a couple of times with a blonde girl (the ad had roles for a brother and sister) who ended up getting cast - which ruled me out, since I look slightly less related to her than to, say, Mao Zedong. My mom and I noticed her on TV in a bunch of other spots over the next year or so, which was kind of weird, and eventually forgot about the whole thing for the most part.
And then I find out today that, as far as I or my mother can tell, that girl was Kirsten Dunst starting her acting career. Weird.